Often when its quiet, I can hear myself wheezing when breathing. Always when breathing out. Did a race recently and felt I had a high pitch wheezing during the latter stages of it (middle distance), but hard to say for sure when you're so out of it.
Used to have exercise induced asthma in my late teens. Doesn't have it anymore according to test 3-4 years ago. No known allergies.
Anyone know what this could be?